Here's the protest passing the American Embassy in Mayfair. Today's demonstration follows a similar Black Lives Matter protest in Brixton on Saturday.

The marches are in solidarity with similar protests in the US around the Black Lives Matter movement. The activist movement sprung up in 2013 after the killing of teenager Trayvon Martin in Florida. The movement protests racial profiling and police brutality towards African Americans.

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BI's John Heggestuen is at the march and estimates there are around 1,000 people marching. The crowd skews young and he estimates the average age is around 24.

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Heggestuen says protestors are getting a lot of support from tourist buses that are passing the protest, with people on the open top cheering the march.

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The protestors brought Oxford Street to a standstill by holding a sit-in protest.

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Heggestuen, who hails from the US, says the police presence on the march is much lighter than equivalent marches in America. Police typically wear riot gear for Black Lives Matter marches in the US.

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The protests are also more focused on the victims than in the US where the focus is more often on the prosecution of police, Heggestuen says. Many marchers have home-made signs drawing attention to victims.

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Protestors are chanting things like: "I know I can be what I want I what to be... If I work hard at it", "We're gonna be all right", "No justice, no peace", "Black lives matter", and "Justice. NOW."

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After Oxford Street, the march moved to Parliament Square. You can see Big Ben looming over the crowds.